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1www.jadestone-energy.com

Corporate Update

August 2020

2

Disclaimer & advisoriesDisclaimerYou must read the following before continuing. The following applies to this document, the presentation of the information in this document any question-and-answer session that may follow, and any additional documentshanded out at the presentation (collectively, the "Presentation"). In viewing the Presentation, you agree to be bound by the following terms and conditions and you represent that you are able to view this Presentation withoutcontravention of any legal or regulatory restrictions applicable to you.

Jadestone Energy Inc. (the “Company“, “Jadestone“, or “JSE“) has issued this presentation and has provided the information in the Presentation, which it does not purport to be comprehensive and which has not been fullyverified by the Company, or any of its employees. shareholders, directors, advisers, agents or affiliates. Neither the Company nor any of its shareholders, directors, officers, agents, employees or advisors give, have given orhave authority to give, any representations or warranties (express or implied) as to, or in relation to, the accuracy, reliability or completeness of the information in this Presentation, or any revision thereof, or of any other writtenor oral information made or to be made available to any interested party or its advisers (all such information being referred to as "Information") and liability therefore is expressly disclaimed to the fullest extent permitted byapplicable law. Accordingly, neither the Company, nor any of its shareholders, directors, officers, agents, employees or advisers take any responsibility for, or will accept any liability whether direct or indirect, express or implied,contractual, tortious, statutory or otherwise, in respect of, the fairness, accuracy, reliability, completeness or correctness of the Information or for any of the opinions contained herein or for any errors, omissions ormisstatements (negligent or otherwise) or for any other communication, written or otherwise, made to anyone in, or supplied with, the Presentation to the fullest extent permitted by applicable law.

This Presentation is for information purposes only and should not be considered as the giving of investment, tax, legal or other advice or recommendation by the Company, or by any of its respective shareholders, directors,officers, agents, employees or advisers. In particular, this Presentation does not constitute or form part of any invitation or inducement to engage in any investment activity nor shall it form a recommendation or inducement to orform part of any offer or invitation to sell or issue, or any solicitation of any offer to purchase or subscribe for any securities or any business or assets of the Company described herein in the United Kingdom, the United Statesof America (“United States”) or any other jurisdiction. Neither this Presentation nor anything contained herein shall form the basis of, or be relied in any connection with, any contract or investment decision or any commitmentwhatsoever. The reader must make its own independent assessment of the Company after making such investigations and taking such advice as may be deemed necessary. In particular, no representation or warranty is given asto the achievement or reasonableness of any future projections, management estimates, prospects or returns and any estimates or projections or opinions contained herein necessarily involve significant elements of subjectivejudgment, analysis and assumptions and each recipient should satisfy itself in relation to such matters. Accordingly, neither the Company nor its shareholders, directors, advisers, agents or affiliates shall be liable for any direct,indirect or consequential loss or damage suffered by any person as a result of relying on any statement or omission in, or supplied with, the Presentation or in any future communications in connection with the Company to thefullest extent permitted by applicable law.

The information in the Presentation is made as of the date hereof and the Company undertakes no obligation to provide the reader with access to any additional information or to correct any inaccuracies herein which maybecome apparent save as may be required by applicable law or the AIM Rules for Companies. This Presentation may not, except in compliance with any applicable exemption under applicable securities law, be taken ortransmitted into any jurisdiction or distributed to any person resident in any jurisdiction. The distribution of this Presentation in or to persons in a jurisdiction may be restricted by law and persons into whose possession thisPresentation comes should inform themselves about, and observe any such restrictions. Any failure to comply with these restrictions may constitute a violation of the laws of the relevant jurisdiction.

Statements contained in the Presentation describing documents and agreements are surmises only and such surmises are qualified in their entirety by reference to such documents and agreements. Past performance of theCompany or its shares cannot be relied on as a guide to future performance.

The content of the Presentation has not been approved by an authorised person within the meaning of the Financial Services and Markets Act 2000, as amended (“FSMA”). Reliance on the Presentation for the purpose ofengaging in any investment activity may expose an individual to a significant risk of losing all of the property or other assets invested. Any person who is in any doubt about the subject matter to which the Presentation relatesshould consult a person duly authorised for the purposes of FSMA who specialises in the acquisition of shares and other securities.

Forward looking statements and information This Presentation includes forward looking statements and information (collectively “forward looking statements”), within the meaning of the applicable Canadian securities legislation, as well as other applicable internationalsecurities laws. The forward looking statements contained in this Presentation are forward looking and not historical facts.

Some of the forward looking statements may be identified by statements that express, or involve discussions as to expectations, beliefs, plans, objectives, assumptions or future events or performance (often, but not always,through the use of phrases such as “will likely result”, “are expected to”, “will continue”, “is anticipated”, “is targeting”, “estimated”, “believe”, “intend”, “plan”, “guidance”, “objective”, “projection”, “aim”, “goals”, “target”,“schedules”, and “outlook” or other similar expressions that are predictive or indicative of future events or the negative thereof.

All statements other than statements of historical facts included this Presentation, including without limitation, those regarding the Company’s financial position, business strategy, plans and objectives of management for futureoperations (including development plans and objectives relating to the Company’s business) are forward looking statements. In particular, forward looking statements in this Presentation include, but are not limited tostatements regarding: (a) oil and gas demand and pricing within Asia Pacific; (b) timing to complete the acquisition and transfer of Maari operatorship, the financial benefits of the acquisition of the Maari Project, the Company’soperations and further acquisitions within New Zealand; (c) operational performance and costs, the timing and results of infill drilling, and further exploration and development activities related to Montara and Stag; (d) the timingthrough design phase (FEED, FDP studies, GSAs) for Nam Du and U Minh; (e) projections for Nam Du and U Minh project sanction, first gas and pipeline capacity; (f) further exploration and development activities related to NamDu; (g) the close engagement with Pertamina and regulators on JSE’s participation in the Ogan Komering PSC and development of existing gas discoveries; (h) exploration drilling on the SC-56 block; (i) the impact of hedginginstruments; (j) timing and application of dividends; (k) projections on oil and gas production and cash flow; (l) quantum of tax obligations; (m) performance on ESG targets; and (n) impact of cost reduction initiatives. Becauseactual results or outcomes could differ materially from those expressed in any forward looking statements, the reader should not place any reliance on any such forward looking statements.

By their nature, forward looking statements involve numerous assumptions, inherent risks and uncertainties, both general and specific, and other factors which contribute to the possibility that the predicted outcomes will notoccur. Some of these risks, uncertainties and other factors are similar to those faced by other oil and gas companies and some are unique to Jadestone. If one or more of these risks or uncertainties materialise, or if anyunderlying assumptions prove incorrect, the Company's actual results may vary materially from those expected, estimated or projected.

In addition, statements relating to “reserves” and “resources” are deemed to be forward looking statements as they involve the implied assessment based on certain estimates and assumptions that the reserves or resourcesdescribed can be profitable produced in the future. There are numerous uncertainties inherent in estimating quantities of reserves and resources and in projecting future rates of production and the timing of developmentexpenditures. The total amount or timing of actual future production may vary from reserve, resource and production estimates.

3

AdvisoriesCertain of the information in this Presentation is “financial outlook” as approved by the Company’s Board of Directors as at February 20, 2020 within the meaning of applicable securities laws. The purpose of this financial outlook is to provide readers with disclosure regardingthe Company’s reasonable expectations as to the anticipated results of its proposed business activities. Past performance is not necessarily indicative of future performance. The forecast financial performance of the Company is not guaranteed. Readers are cautioned thatthis financial outlook may not be appropriate for other purposes, and should not place undue reliance on the forward looking statements which are based on the current views of the Company on future events.

Although the Company believes that the expectations reflected by the forward looking statements presented in this Presentation are reasonable, the Company’s forward looking statements have been based on assumptions and factors concerning future events that may proveto be inaccurate. Those assumptions and factors are based on information currently available to the Company about itself and the businesses in which it operates. Information used in developing forward looking statements has been acquired from various sources includingthird party consultants, suppliers, regulators and other sources.

The Company’s AIM Admission Document, annual report and condensed consolidated audited financial statements for the year ended December 31, 2019, and other documents filed with securities regulatory authorities (accessible through the SEDAR websitewww.sedar.com) describe risks, material assumptions and other factors that could influence actual results and are incorporated into the Presentation by reference.

Any forward looking statement speaks only as at the date on which this Presentation is made. The Company expressly disclaims any obligation or undertaking to disseminate any updates or revisions, except as required by law, including section 5.8(2) of National Instrument51-102, to any forward looking statements contained herein to reflect any change in the Company’s expectations with regard thereto or any change in events, conditions or circumstances on which any statement is based.

New factors emerge from time to time and it is not possible for management to predict all of such factors and to assess in advance the impact of each such factor on the Company’s business or the extent to which any factor, or combination of factors, may cause actual resultsto differ materially from those contained in any forward looking statement. The impact of any one factor on a particular forward looking statement is not determinable with certainty as such factors are dependent upon other factors, and the Company's course of action woulddepend upon management’s assessment of the future considering all information available to it at the relevant time.

No profit forecastsNothing in this Presentation or in the documents referred to in it should be considered as a profit forecast. Past performance of the Company or its shares cannot be relied on as a guide to future performance.

Non-GAAP measuresThis Presentation contains certain terms, including EBITDAX and unlevered free cashflow which are non-GAAP financial measures which do not have a standardised meaning prescribed by IFRS. These non-GAAP financial measures are included because management usesthis information to analyse financial performance, efficiency and liquidity and it may be useful to investors on the same basis. EBITDAX is a non-GAAP measure which should not be considered an alternative to, or more meaningful than, “net earnings (loss)” as determined inaccordance with IFRS, as an indicator of financial performance. EBITDAX equals net earnings (loss) plus financial expenses (income), provisions for (recovery of) income taxes, and depletion, depreciation and amortisation and exploration expense. Unlevered Free Cashflowis a non-GAAP measure which should not be considered an alternative to, or more meaningful than “Net cash increase in cash and cash equivalents” as determined in accordance with IFRS, as an indicator of financial performance. Unlevered free cash flow is generated fromearnings before tax, interest and DD&A, less taxes, capital expenditures and changes in working capital. Unlevered free cashflow is presented to assist management and users of the financial statements in analyzing the ability of the business to generate cash before financingactivities. Because these non-GAAP financial measures do not have a standardised meaning prescribed by IFRS, they are unlikely to be comparable to similar measures presented by other companies and should not be considered in isolation or as a substitute for measuresof performance prepared in accordance with IFRS.

Oil, natural gas and natural gas liquids information The oil, natural gas and natural gas liquids information in this Presentation has been prepared in accordance with National Instrument 51-101 – Standards of Disclosure for Oil and Gas Activities and the Canadian Oil and Gas Evaluation Handbook (the "COGE Handbook").Terms related to resources classifications referred to in this document are based on definitions and guidelines in the COGE Handbook which are as follows.

A barrel of oil equivalent ("BOE") is determined by converting a volume of natural gas to barrels using the ratios of six thousand cubic feet ("Mcf") to one barrel. BOEs may be misleading, particularly if used in isolation. A BOE conversion ratio of 6 Mcf:1 BOE is based on anenergy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead. Given that the value ratio based on the current price of oil as compared to natural gas is significantly different from the energyequivalency of 6:1, utilising a conversion on a 6:1 basis may be misleading as an indication of value.

The technical information contained in this Presentation has been prepared in accordance with the March 2007 guidelines endorsed by the Society of Petroleum Engineers, World Petroleum Congress, American Association of Petroleum Geologists and Society of PetroleumEvaluation Engineers Petroleum Resource Management System.

Henning Hoeyland of Jadestone Energy Inc., a Subsurface Manager with a Masters degree in Petroleum Engineering who is a member of the Society of Petroleum Engineers and who has been involved in the energy industry for more than 19 years, has read and approved thetechnical disclosure in this Presentation.

The reserve figures in this Presentation in respect of the Maari Project are based on a reserves and resources audit prepared for the Company by ERC Equipose Ltd, an independent qualified reserves auditor, with an effective date of December 31, 2018 and based on real(2019) oil prices for Brent crude of US$61, US$64, US$66, and US$67/bbl for 2019, 2020, 2021, and 2022 beyond, respectively.

Overseas JurisdictionsNeither this Presentation nor any copy of it may be taken or transmitted into the United States, its territories or possessions or distributed, directly or indirectly, in the United States, its territories or possessions. Neither this document nor any copy of it may be taken ortransmitted into Australia, Japan or the Republic of South Africa or to any securities analyst or other person in any of those jurisdictions. Any failure to comply with this restriction may constitute a violation of United States, Australian, Japanese or South African securitieslaw. The distribution of this document in other jurisdictions may be restricted by law and persons into whose possession this document comes should inform themselves about, and observe, any such restrictions.

PresentationCertain figures contained in this Presentation, including financial and oil and gas information, have been subject to rounding adjustments. Accordingly, in certain instances, the sum or percentage change of the numbers contained in the Presentation may not conform exactlywith the total figure given. All currency is expressed in US dollars unless otherwise directed. This document has been prepared in compliance with English Law and English courts will have exclusive jurisdiction over any disputes arising from or connected with this document.

4

Jadestone Energy, corporate overviewOverview

Strengthening the balance sheet, value generation ongoing

Highlights

Market snapshot, US$million except where noted

Market snapshot, AIM:JSE

Share price (Aug 6, 2020) £0.68

Diluted shares on issue2, mm 467.7

Equity value3 417.4

Net debt/(cash)4 (78.2)

Enterprise value 339.21 As at March 31, 2020, includes restricted cash comprising DSRA of US$12.2 million and US$10.0

million in support of a bank guarantee to a key supplier2 Includes 12.0mm exercisable, in-the-money options accounted for via the treasury stock method 3 Based on AIM closing of GBP 0.68/share and GBP/US$ exchange rate 0.7618 as of Aug 6, 20204 At Jun 30, 2020, excludes US$10.0 million bank guarantee to a key supplier

! Managing and minimising COVID-19 impact— Safe operations continuing— No adverse impact to operations to date

! Strengthening balance sheet, ongoing cash flow— Cash ~US$120 million, borrowing of ~US$37 million— Break even operating cashflow in 2020 down to

US$20/bbl, unlevered free cashflow below US$27/bbl! Utilising capex flexibility to optimise returns

— Nam Du/U Minh delay saves ~US$90 million— Infill deferral locks in lower costs & higher returns,

producing into a higher oil price environment! Cost optimisation project underway

— Project Clover targeting US$5/bbl in 2020 savings! Maari acquisition proceeding toward close H2 2020

— Maari acquisition progressing toward 2H close, highly accretive tuck-in, 0.28x 2P NPV, $3.6/2P reserves

! M&A screening continuing— Potential growth through distressed opportunities

As at Mar-20 Dec-19

Cash1 119.4 99.4

Total assets 780.5 755.1

Book equity 245.2 225.5

For the quarter to Mar-20 Dec-19

Revenue 74.2 91.2

Adjusted EBITDAX 30.9 59.9

Operating cashflow before Δ in w/c 36.0 58.0

After tax profit/(loss) 0.3 10.4

Financial Statement extract, US$million

5

Key assets and reserves

! Cash acquisition of Lemang adds 17.2 mm boe 2C resource— Growth through development of rich gas field— Introduces near-term gas production— Natural hedge for Jadesone against oil

! Ongoing value accretive regional M&A in 2020 and beyond

Jadestone Energy—updated portfolio overviewBuilding a balanced, low risk, full cycle portfolio

Asset Country W.I. (%) 2P1

(mm bbls)2C2

(mm boe) Production (net WI) / status

Maari 69% 12.2 --

12,000—14,000 bbls/d 2020 production guidanceMontara 100% 27.0 --

Stag 100% 14.8 --

OK3 -- Reserves estimated with new PSC3

c.1.4 mboe/d (at March 2018)

Lemang 90% 17.2 Subject to FID

Nam Du(Block 46/07) 100% -- 17.9 Subject to FDP approval

U Minh(Block 51) 100% -- 12.3 Subject to FDP approval

Tho Chu(Block 51) 100%4 -- 63.7 Suspended development

awaiting ullage

SC56 25% -- 21.0 Subject to further appraisal

Comments

Key assets location

1 Maari based on 2P reserves audit by ERCE adjusted to year end 2019. Montara and Stag based on a reserves report prepared for the Company by ERCE as of Dec 31, 2019.2 Lemang 2C resources per ERCE review, June 2020, at 90% interest (15.5 mm boe at 81% interest, assuming local government participation). 2C resources for other assets per ERCE CPR (as at Dec 31, 2017) 3 Anticipate to re-enter the PSC for up to a 40% working interest4 Before back-in right of 3%

51

46/07

SC56

Ogan Komering3

Stag

INDONESIA

MALAYSIA

SINGAPORE

AUSTRALIA

Gulf of Thailand

Celebes Sea

Timor Sea

Montara

NEW ZEALAND

Maari

Lemang

Producing Development

Exploration Other

6

Ensuring sustainability……is not just about what we do, but how we do it

Social and human capital

Environment

Governanceand leadership

0No harm to environment and zero

‘reportable’ incidentsENVIRONMENTAL

MANAGEMENT

0No uncontrolled hydrocarbon releases to the environment

EMISSIONS AND DISCHARGES

10% reductionReducing our energy and GHG

emissionsGHG

0A zero lost time injury

frequency rateOCCUPATIONAL

HEALTH & SAFETY

23%Females in

leadership positionsWORKFORCE

Target 10% increase investment

Engaged and consulted stakeholders

STAKEHOLDER MANAGEMENT

Almost

US$177 million in operating cashflow

ECONOMIC PERFORMANCE

Top Quartile Governance Standards

Performance based leadership

LEADERSHIP AND GOVERNANCE

0Zero regulatory enforcement action

REGULATORY MANAGEMENT

0Zero critical risk incidents

CRITICAL INCIDENT RISK MANAGEMENT

0Zero Tier 1 asset integrity or

process safety incidentsASSET INTEGRITY AND PROCESS

SAFETY * against API 754

0Zero incidents of non-compliance

BUSINESS ETHICS AND TRANSPARENCY

Framework Scorecard and targets

Striving for excellence, with a target of zero incidents, accidents and impacts wherever possible

7

COVID-19 risk assessmentStress-testing Jadestone’s financial resilience

Financial resiliency in

2020

March 31, 2020 cash on hand:

~US$120 million

March 31, 2020 debt

outstanding: US$37 million

~50% of Montara

production hedged at

US$68.45/bbl, before premia FCF breakeven

in 2020 below ~$27/bbl, OCF breakeven in 2020 down to

US$20/bbl

Highly discretionary

capex programme:

~US$140 million delayed

Jadestone oil continuing to

sell at a premium to

Brent

! Capital efficiency— ND/UM delayed— Australian drilling delayed— Brownfield projects delayed

+Jadestone position entering COVID-19 lockdown period Additional initiatives—Project Clover

US$3—4/bbl savings in 2020 identified from Project Clover

! Intensifying cost reductions— Every asset operating budget

reviewed & revised— Operator partnerships— Technology adopted— AU$60 million locked in at US$0.6344

FX rate— Rephasing tax payments

! G&A austerity measures— Freezing salaries — Cutting exec pay 25%— Reducing headcount— Reducing other G&A

8

Project Clover2020 savings versus 2020 work programme & budget

1 Initiatives have been executed or arrangements/contracts finalised. Cash flow benefits are expected to be realised from April onwards.2 Initiatives are in the process of being formalised. Cash flow benefits are expected to be realised from June onwards.

Approximately US$3.5/bbl cash savings completedTargeting opportunities beyond US$5/bbl

US$22 million savings implemented, additional US$10 million being pursued

0 2 4 6 8 10 12

Other

Capex

G&A

Opex

US$million

Completed

Targetted

! Helicopter, airbase and supply boat sharing agreements in place to end of 2020

! Salary reductions from senior management team downwards

! Review maintenance & operating costs

! Delay and reduction of minor capital (Stag & Montara)

! Annular well control BOP to reduce future workover costs

! Purchase and store diesel fuel at market low point (Stag & Montara)

! Lower Australian FX rate of 0.6344 locked in for AU$60mm in 2020

! Savings versus 2020 WP&B exclude ND/UM development and Australian infill programme

1

2

Select initiatives

! Objective: enhance business performance and efficiency — Defer capital programme

— Optimise commercial terms with vendors

— Review and “right-size” the organisation

— Identify and reduce cost and process inefficiency

9

1,000

2,000

3,000

4,000

20

30

40

50

H1 17 H2 17 H1 18 H2 18 H1 19 H2 19 Q1 20

Cost , US$/bbl Production, bbls/d

0

5,000

10,000

15,000

10

15

20

25

30

Q4 18 Q1 19 Q2 19 Q3 19 Q4 19 Q1 20

Cost , US$/bbl Production, bbls/d

Maintenance & weather

1 Opex/bbl excludes workovers and abnormal repairs and maintenance, but includes lease payments for quarter to quarter comparability

Operational performanceJadestone operatorship was a step change for both Stag and Montara

Continuing to deploy a wide range of measures to increase production, reduce costs and enhance returns

! Successful well interventions

! Optimising operating pressure

! Gas re-injection compressor reliability

! Campaign maintenance

! US$4 million logistics savings in 2020

! 49H infill well success

! Optimising operating pressure

! Well workover average cost reduction

! Moved to minimum manning

! Installing advanced gas handling equipment

Montara

Stag

US$/bbl bbls/d

RLWI, umbilical, compressor

recommissioned

US$/bbl bbls/d

Uptime hit by cyclones & 49H infill

3 workovers & cyclones

1

1

Well 49H on stream

10

Montara—value is increased after acquisitionConsistent with Jadestone’s strategy of revitalising mid life assets

1 72% is the 2017 actual uptime including downtime due to unplanned, planned and weather events

Levers to unlock value (US$mm)

0 200 400 600 800

Exploration upside

Hub opportunities

Potential tangible value

Additional infill targets

G&A reduction

Opex reduction

Uptime improvement

2P reserve adds

Attractive acquisition cost

Jadestone’s core capabilities

Production optimisation, reservoir management, infill drilling

Increased uptime from 72%1 to > 80% in H1

Strong acquisition metrics: <$7 per bbl 2P reserves / <$19,000 per flowing bbl

Accelerating toward target of >20% reduction

Reduced corporate charges and overheads by >50%

On track to deliver value up to 3x acquisition cost

Exploring technical & commercial potential

Additional infill firmed up, moved to 2P

8 potential leads identified

Successfully unlocked significant value from Montara post-acquisition

11

Southwest Vietnam gas developmentNam Du (Block 46/07) and U Minh (Block 51) gas fields

ND/UM fields c. 30km from PM-03 CAAProject overview

! 171bcf of 2C resources with a further circa 31bcf in Nam Du South fault block

! Domestic gas supply to existing Ca Mau industrial complex, supporting rapid economic growth in Southern Vietnam

! Steady predictable cash flow tied to a fixed gas price, free from oil price volatility

! Provides a hub to potentially develop other nearby discoveries

PM-3

Pipeline

! Project delayed due to ongoing delays in approvals, and amidst Covid-19 oil price drop

! 2020 capex reduced by circa US$90 million

! Negotiating gas sales terms, profile and timing

! Evaluating ways to enhance value further

! First gas rescheduled to late 2022 earliest, or 2023

Update Development concept

12

Maari asset acquisition, 69% operated interestStrong acquisition metrics, progressing toward H2 2020 completion

! Headline cash consideration of US$50 million— 2P NPV10 of US$180 million1

! Strongly accretive on all metrics at acquisition— 2P reserves 13.9mm bbls1 (net)— Unlevered IRR of 100%. Circa 50% even if all abex is assumed

as a cash outflow on day one2

! Significant value creation opportunities beyond 2P with large oil-in-place and low recovery factors to date

Transaction overview

1 Based on a reserves audit prepared for the Company by ERCE, an independent qualified reserves auditor, with an effective date of December 31, 2018 and incorporating ERCE’s current oil price assumption deck (2019 real Brent crude oil prices of US$61/bbl, US$64/bbl, US$66/bbl, and US$67/bbl for 2019, 2020, 2021, and 2022 and beyond, respectively), and prepared in compliance with the COGE Handbook2 IRRs based on 2P ERCE certified case. Circa 50% unlevered IRR based on all future estimated abandonment expenditure discounted back to day one at 2.5%3 Requires NZ Government and partner consents relating to operatorship, title transfer, and other customary conditions

(4)

! Expected to close H2 20203

! Overseas Investment Office consent obtained ! JV partner change of operatorship approved! Application to New Zealand Petroleum and Minerals progressing! WorkSafe regulator reviewing Jadestone HSE capability in line

with anticipated schedule! Human resourcing plan progressing with conditional offers being

prepared

Update

Shallow water Taranaki Basin

13

$5.44/boe development

capex

Lemang, Indonesia asset acquisitionLow-cost resource add, near-term development in Jadestone core area

Transaction overview

$0.70/2C resource

acquisition cost

1

! Asset acquisition of a 90% operated interest in the Lemang PSC1

! Headline initial consideration of US$12 million funded from cash

— Additional US$5 million on first gas,

— Additional contingent payments of up to US$26.7 million may be triggered if certain upside outcomes occur

! Key acquisition highlights, net to Jadestone

— 2C resource 17.2 mm boe2

— Anticipated plateau production of c. 5.3 mboe/d, net to Jadestone3

— NPV10 of US$57 – US$80 million4

— NAV per share accretion of 4.3-6.3%— US$126 million cost pool5

! Introduces further balance and diversity to the portfolio

— Gas weighting increases to 37%— PSC vs concession, fixed vs variable hydrocarbon pricing

! Fully flexible development timeline

— FEED complete, key agreements well progressed— Anticipated development capex of US$94 million6

— No near-term licence renewal commitments

! Expected to close Q1 20217

1 Local government has a statutory right to participate for a 10% interest. If exercised, Jadestone’s net interest would be 81%2 Based on an independent review of contingent resources by ERCE, an independent qualified reserves auditor, and presented on a net 90% working interest basis. Based on 81% (assuming local government participation), 2C resource is 15.5 mm boe. 2C resource volumes are presented on an unrisked basis. ERCE estimates the chance of development at 90%. 3 Based on 90% working interest. Plateau at 81% is 4.8 mboe/d4 Based on ERCE 2C volumes and reflecting a US$5 – US$6/mm btu gas price range and certain other commercial and other assumptions5 Subject to GoI audit for cost recovery6 Anticipated development capex of US$94 million gross, based on FEED studies conducted to date and drilling of 2 infill wells plus 2 existing well workovers7 Requires Indonesian Government consent, Jadestone appointment as operator under the JOA and other JOA consents as required

0.15 - 0.21x2C NPV10

2,4 2 6

14

2P reserves + 2C resources mixPro forma for Maari and Lemang, excluding Tho Chu and SC56

2P +

2C

with

Maa

ri, m

m

boe

Lemang adds to the Group balance of gas vs liquids, fixed vs variable hydrocarbon pricing, and concession vs PSC fiscal terms

2P +

2C

with

Lem

ang,

mm

bo

e

By asset Gas/liquids & fixed price/variable Concession/PSC

Montara MaariStagND/UM Lemang

Crude oil CondensateNatural gas

LPG Concession PSC

Note: Montara and Stag based on a reserves report prepared for the Company by ERCE as of Dec 31, 2019. Maari based on 2P reserves audit by ERCE as of Dec 31, 2018, adjusted by management to year end 2019. ND/UM 2C resources per ERCE audit as of Dec 31, 2017. Lemang 2C resources per ERCE review, June 2020, at 90% interest (15.5 mm boe at 81% interest, assuming local government participation). Excludes ERCE audited 2C resources for Tho Chu and SC56 of 63.7mm boe and 21.0mm boe respectively

Total = 84.1mm boe Total = 84.1mm boe Total = 84.1mm boe

Total = 101.3mm boe Total = 101.3mm boe Total = 101.3mm boe

34%

64%

2%

36%

64%

47%53%

37%

53%

6% 4%

36% 32%

17%

27%

15%

12%

30%

14% 18%

15

Lemang acquisition highlightsLow cost resource add, portfolio balance

! US$0.70/boe 2C resource1,2

! Funded through available cash resourcesLow cost resource add

Low technical risk

Portfolio balance and diversification

Flexible, low-cost development

Long-life, stable production

Compelling value proposition

! Fully appraised liquids rich gas! Within one of Jadestone’s core areas, with deep history and expertise

! Increases resource base to 37% gas weighted (2P reserves + 2C resource)3

! Fixed price gas provides a natural hedge to volatile oil prices

! US$5.44/boe development cost, taking advantage of existing wells4

! No near-term licence commitments! Short tie-in to existing pipeline with ample ullage

! Life of field gas sales agreement to be signed! Six-year production plateau c. 5.3 mboe/d5

! 0.15 – 0.21x 2C NPV101,6

1 Based on an independent review of contingent resources by ERCE, an independent qualified reserves auditor, and prepared for the Company in June 2020 in accordance with National Instrument 51-101 –Standards of Disclosure for Oil and Gas Activities and the Canadian Oil and Gas Evaluation Handbook (“COGEH”), and presented on a net 90% working interest basis. Based on 81% (assuming local government participation), 2C resource is 15.5 mm boe. 2C resource volumes presented represent the sub-class Development Pending, as defined by COGEH, and are presented on an unrisked basis. ERCE estimates the chance of development at 90%. 2 Based on headline initial consideration of US$12 million. A further consideration of US$5 million is payable to the seller upon first gas and from initial revenues, in addition to further contingent payments of up to US$26.7 million, which may be triggered in the event that certain upside outcomes occur3 Excludes Tho Chu and SC564 Anticipated development capex of US$94 million gross, based on FEED studies conducted to date and drilling of 2 infill wells plus 2 existing well workovers5 Based on 81% (assuming local government participation), six year plateau production averages 4.8 mboe/d6 Based on ERCE 2C volumes and reflecting a US$5 – US$6/mm btu gas price range (subject to negotiation) and certain other commercial variables and assumptions

16

Strong downside oil price protectionUS$68.45 Dated Brent swaps through to September 2020

Existing capped swap summary

! Swaps cover approximately 50% of Montara’s planned production for first 9 months of 2020— Around a third of Group

production! US$68.45/bbl average swap price! Last Montara lifting at a US$6.10/bbl

premium to Brent (MV55, April 4, 2020)— Implies total average realisation of

~US$74.55/bbl on swapped barrels! US$32.4 million fair value as at March

31, 2020— US$8.2 million of hedging income

in Q1 2020

Montara swapped barrels in the 9 months to Sep 2020 will sell for around US$75/bbl based on most recent lifting

45

60

75

90

0

250,000

500,000

Q1 2020 Q2 2020 Q3 2020

Swap volume (LHS) Call volume (LHS) Swap strike (RHS) Call strike (RHS)

Vol, bbls

Volume weighted swap price of US$68.45/bbl

Dated BrentUS$/bbl

Comments

17

Resilient cash flow generationDiscretionary capex programme provides optionality

Reduced capex programme more than offsets reduced benchmark prices

The business is on track to generate surplus FCF in 2020, with headroom for Maariacquisition and the maiden dividend

1 Reduced oil price based on Bloomberg consensus, May 25, 2020 (Q2 2020: US$32/bbl, Q3: US$36/bbl, Q4: US$42/bbl)2 2019 Australian corporate tax repayment rephased over 18 months3 Estimated impact of Project Clover initiatives described on slide 10, to date, including impact of the lower AU$/US$ forward already locked-in

0

100

200

300

CashJan 2020

2020OCF

2020tax paid

2020capex

Reducedoil

price

Vietnamcapex

deferral

Infillcapex

deferral

Taxrephasing

Debt CashDec 2020

ProjectClover

Adjustedcash

Dec 2020Capital markets day (Feb 25)

1

2 3

US$ million

18

Jadestone reserves & resources summaryA material opportunity set

Effective Dec 2019 Jadestone locks in a 26% jump in 2P reserves pro forma for Maari

Jadestone resources outlook, mm boe

Note: Note: Group 2P reserves as of December 31, 2019 as per ERCE year end audit. Maari 2P reserves as evaluated at the time of acquisition and audited by ERCE, net of planned 2019 production. Nam Du/U Minh volumes are based on management profiles consistent with ERCE 2C volumes with subsequent economic cut-off applied. U Minh includes life extension volumes from Nam Du. Nam Du Southern Channel volumes are based on management profiles consistent with ERCE prospective volumes with subsequent economic cut-off applied. Tho Chu volumes are 2C per ERCE CPR (as at Dec 31, 2017). Other resource potential comprises Jadestone management estimates for Maari/Montara upside activities, Block 51 resource upside and ERCE 2C volumes for SC56

0

10

20

30

40

50

Stag 2PDec 2018

Montara 2PDec 2018

2019Production

Reserveadds

Group 2PDec 2019

mm bbls

Jadestone 2P reserves, mm bbls

0

50

100

150

200

250

Group 2PDec 2019

Maari 2PDec 2019

Nam Du U Minh Nam DuS/Channel

Tho Chu Otherpotential

Total resourcepotential

mm boe

19

Group work programmeMedium term outlook of activity across the Jadestone portfolio

Asset Activity 2020 2021 2022 +

Ope

ratio

ns

Montara Production optimisation & opex reductions

Stag Production optimisation & opex reductions

Maari Complete transition of operatorship, embed Jadestone operating culture

Prod

uctio

n

Montara Low pressure operations

Montara Infill drilling campaign

Stag Infill drilling campaign

Dev

elop

men

t

Nam Du & U Minh Final Vietnam Government approvals/FID

Nam Du & U Minh Phase 1 execution (Nam Du)

Expl

orat

ion

&

appr

aisa

l Montara 3D seismic acquisition

Montara/Stag/ND/UM Near field E&A evaluation, thereafter drilling

Earliestfirst gasend 2022

20

Revised 2020 guidanceVersus 2019 guidance, 2019 actual and 2018 actual

2018 actual1 2019 guidance 2019 actual 2020 guidance Status

Capex2,US$ million US$10 million US$66 – 81 million2 US$78 million2 US$160-190 million

US$30 – 35 millionReduced

investment

Production,bbls/d

4,057boe/d

13,500 – 14,500bbls/d

13,531bbls/d

13,500-15,500bbls/d

12,000 – 14,000 bbls/d

Production impact of

deferred infill drilling

Opex,US$/bbl

US$28.72/boe

US$21.00 – 24.00/bbl

US$22.85/bbl

US$20.50 – 23.50/bbl

No change. Project Clover

targeting further savings

Shareholder distributions,US$ million

— — — US$7.5 – 12.5million No change

1 2018 production includes Montara production from September 28, 2018 (transaction closing) averaged over the 96 days to year end2 Guidance for capex for 2019 was characterised as “major spend” as it included large abnormal opex, including work associated with a large portion of riserless light well intervention programme, and not captured in opex guidance

21

CommitmentsTop of mind priorities. We will…

Operations Liquidity Returns Growth

Report on our ESG performance

We will be around at year-end 2020 in a

strong financial position

Continue strengthening our balance sheet

Use only manageable low cost debt to finance

the business

Pay our maiden dividend

Close the Maariacquisition 2H 2020

Drill Australia infill wells in 2021

Develop Nam Du / U Minh

Remain nimble with capex

Focus on the “controllables” to

protect our people and operations in light of

COVID-19

Maintain discipline with inorganic opportunities

Operate with no backlog of safety-

critical maintenance